• DOI:10.1086/505419
Corpus ID: 18779443

Ammonia as a tracer of chemical equilibrium in the T7.5 dwarf Gliese 570D

@article{Saumon2006AmmoniaAA,
  title={Ammonia as a tracer of chemical equilibrium in the T7.5 dwarf Gliese 570D},
  author={D. Saumon and M. S. Marley and M. C. Cushing and S. Leggett and T. Roellig and K. Lodders and R. Freedman},
  journal={The Astrophysical Journal},
  year={2006},
  volume={647},
  pages={552-557}
}

D. Saumon, M. S. Marley, +4 authors R. Freedman

Published 2006

Physics

The Astrophysical Journal

We present the first analysis of an optical to mid-infrared spectrum of the T7.5 dwarf Gliese 570D with model atmospheres, synthetic spectra, and brown dwarf evolution sequences. We obtain precise values for the basic parameters of Gl 570D: Teff = 800-820 K, log g (cm s-2) = 5.09-5.23, and log = -5.525 to -5.551. The Spitzer Infrared Spectrograph (IRS) spectrum shows prominent features of ammonia (NH3) that can only be fitted by reducing the abundance of NH3 by about 1 order of magnitude from… CONTINUE READING

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